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authorBob Copeland <me@bobcopeland.com>2009-05-19 23:37:31 -0400
committerJohn W. Linville <linville@tuxdriver.com>2009-05-20 14:46:32 -0400
commit9c8b3eddc0666255851942df8ec72cd91d22f280 (patch)
treebeef68ff428b4414073142b34910010411b6aaac /drivers/net
parent61405e97788b1bc4e7c5be5b4ec04a73fc11bac2 (diff)
ath5k: avoid and warn on potential infinite loop
If we are trying to interpolate a curve with slope == 0, the return value will always be the y-coordinate. In this code we are looping until we reach a minimum y-coordinate on a line, which in the 0-slope case can never happen, thus the loop never terminates. The PCDAC steps come from the EEPROM and should never be equal, but we should gracefully handle that case, so warn and bail out. Reported-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Bob Copeland <me@bobcopeland.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/wireless/ath/ath5k/phy.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath/ath5k/phy.c b/drivers/net/wireless/ath/ath5k/phy.c
index d0d1c350025..a876ca8d69e 100644
--- a/drivers/net/wireless/ath/ath5k/phy.c
+++ b/drivers/net/wireless/ath/ath5k/phy.c
@@ -1897,6 +1897,9 @@ ath5k_get_linear_pcdac_min(const u8 *stepL, const u8 *stepR,
s16 min_pwrL, min_pwrR;
s16 pwr_i;
+ if (WARN_ON(stepL[0] == stepL[1] || stepR[0] == stepR[1]))
+ return 0;
+
if (pwrL[0] == pwrL[1])
min_pwrL = pwrL[0];
else {